Hand to hand? None of them. Eren had porco figured by the end of their fight and got the capabilties of the Jaws titan in his head now. He has already beaten Riener handily multiple times so I have no hope of Reiner getting in a decent pace at all.
I mean If Eren can control the warhammer stuff with some accuracy he can pull the Move him and Mikasa did to Porko all by himself with Just warhammer spikes. And Annie.... I'm not sure, she was the best person at hand to hand but then Eren has been nothing but a monster since the time skip so I'm gonna say that match up is probably more even or weighted in his favor after all these years.
I think you overrate Eren. He'd have lost to the Warhammer 1-on-1 without the Scouts. He'd have been eaten by Porco without Levi coming in for the save. And without Mikasa slicing his legs, he'd of struggled with Porco in a 1-on-1 too. Jaws has Eren beat on both speed and agility. Until Mikasa neutralized that, Eren couldn't do anything to him. Now he has the Warhammer power he has options to deal with Jaws, but Reiner aside he's never convincingly beat another shifter on a 1-on-1 scenario. He's definitely the strongest individual shifter at this point, but I don't necessarily see him as unbeatable.